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Dynamic channel allocation andpower control; Various strategies have been
proposed and/or adopted to obtain
further improvement in system
performance.; One approach is the use of directional
antennas to reduce the number of
interfering signals with which a desired
signal has to contend ; Another
approach is that of reducing cell size,
hence gaining more cells in a
geographic region, with consequent
increase in capacity, with a given reuse
characteristic included. ; Cellular systems are, in fact, moving
toward a hierarchy(分层) of cell sizes:
larger cells, called macrocells; microcells
and picocells.
Microcells, to be used, ideally, in the
more crowded urban environments
where the traffic load does dictate(驱使)
reducing the cell size (base station
antennas and their attendant (附属的)
transmitter-receiver systems may be
located at the reduced height of street
lamp posts); and picocells, to be used
principally(主要) in indoor cellular
systems. ; We discuss two techniques in
this chapter: dynamic channel
allocation (DCA) and power
control .
Some simulation(仿真)
studies have shown that the
combination of DCA and power
control can provide substantially
(相当大的) greater improvements
in system performance than the
use of either technique alone .;4.1 Dynamic channel allocation; The allocation of channels to cells
described in the previous chapter
has implicitly(含蓄地,暗中地)
assumed fixed channel allocation
(FCA): groups of channels are
assigned permanently(永久的)
to given cells following a prescribed
(规定的,指定的 )reuse pattern. ; Recall from the previous chapter
that, with the reuse strategy
described there, the total available
set of channels is divided into C
groups, each group then being
assigned to a specific cell in a
cluster of C cells。; DCA refers to a variety of
techniques in which channels may
be allocated to users in a cell in
accordance with varying traffic
demands.
The possibility of us
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